Reply

Dear visitor, welcome to SPRINKLER TALK FORUM - You Got Questions, We've Got Answers. If this is your first visit here, please read the Help. It explains how this page works. You must be registered before you can use all the page's features. Please use the registration form, to register here or read more information about the registration process. If you are already registered, please login here.

Attention: The last reply to this post was 4794 days ago. The thread may already be out of date. Please consider creating a new thread.

<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote">Why is it that most baseball fields/commercial designs with long runs, they reduce the pipe size as the run goes on? <hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">
To save money!

Like SamIV says, they size the pipe based on the amount of water that must flow through it (relative the how much pressure loss they can tolerate).

However, it thing the main point RVLI was trying to make is accurate...
The tiny 1/2" pipe just can't adiquately feed three sprinklers, especially since the dry run involved 1/2" or 5/8" garden hoses (lots of pressure loss when trying to push enough water to feed three sprinklers).

Say there are 6 heads on a zone all with 2 GPM (Galons per Minute) nozzles. This will be a 12 GPM zone. To size the pipe at the first head in this zone, the pipe will have to be able to deliver 12 GPM of water with as little pressure loss as possible. When you go to the next head the pipe will have to deliver 10 GPM. . By the time you get to the last head on the zone the pipe will have to deliver only 2 GPM because that is all the last head is delivering. So this is why pipe can be smaller at the end of the zone. And by decreasing the pipe diameter you also decrease pressure. Smaller pipe, more pressure loss. Not the other way around.

I wanted to do it inground, about 3in (live in S TX,never gets cold) and put a conection near the HB for a quick connect. Something simple. I would put a Max of three sprinklers on the same line. I tried a dry run with regular hoses, and it did not work. The first sprinkler worked fine but the other two that were connected did nothing.

Example:
S
h
h
ThhhhhhhhhhhhhhShhhhhhhhhC HB
h
h
S
What did I do wrong? Will it work if it is PVC? Or just scrap the whole idea?